The mystery of the ninth planet gets deeper and deeper. Astronomers have long speculated that a ninth planet must exist beyond the known eight planets in our Solar System, but no evidence has been found - until now. A new study suggests that this ninth planet may be hiding in the very outer reaches of our Solar System. The research team has identified several objects in the Kuiper Belt, a region of icy bodies beyond Neptune, that could be clustered together by the gravitational pull of an unseen planet. If true, this planet could be the elusive Planet Nine, and it could be much bigger than previously thought. We may finally be closing in on the answer to one of the biggest mysteries of our Solar System.

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source: Phys.org